21937406629 has 2 divisors, whose sum is σ = 21937406630. Its totient is φ = 21937406628.

The previous prime is 21937406573. The next prime is 21937406681. The reversal of 21937406629 is 92660473912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21933017604 + 4389025 = 148098^2 + 2095^2 .

It is a cyclic number.

It is not a de Polignac number, because 21937406629 - 2⁷ = 21937406501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21937406129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10968703314 + 10968703315.

It is an arithmetic number, because the mean of its divisors is an integer number (10968703315).

Almost surely, 2^21937406629 is an apocalyptic number.

It is an amenable number.

21937406629 is a deficient number, since it is larger than the sum of its proper divisors (1).

21937406629 is an equidigital number, since it uses as much as digits as its factorization.

21937406629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 49.

The spelling of 21937406629 in words is "twenty-one billion, nine hundred thirty-seven million, four hundred six thousand, six hundred twenty-nine".